Permutation and Combination
Posted on 2011-10-26
HI guys: I am trying to put the permutation and combination in my head but still have problem to figure it out if the problem is about P or C. I have a question and the answer of that question is P(9,5). I just want to know how i know its a permutation or combination by just looking at the problem. I understand that permutation means order matters and combination means order doesnt.
There are nine empty seats in a theater, and five customers need to find places to sit. How many different ways can these five seat themselves ?